Ensure ClassBTypes constructed from symbol and classfile are identical

A super call (invokespecial) to a default method T.m is only allowed if
the interface T is a direct parent of the class. Super calls are
introduced for example in Mixin when generating forwarder methods:

    trait T { override def clone(): Object = "hi" }
    trait U extends T
    class C extends U

The class C gets a forwarder that invokes T.clone(). During code
generation the interface T is added as direct parent to class C. Note
that T is not a (direct) parent in the frontend type of class C.

This commit stores interfaces that are added to a class during code
generation in the InlineInfo classfile attribute. This allows filtering
the interface list when constructing a ClassBType from a classfile.

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